Specific profiles of ion channels and ionotropic receptors define adipose- and bone marrow derived stromal cells
Abstrakt
Adherent, fibroblastic cells from different tissues are thought to contain subsets of tissue-specific stem/progenitor cells (often called mesenchymal stem cells). These cells display similar cell surface characteristics based on their fibroblastic nature, but also exhibit differences in molecular phenotype, growth rate, and their ability to differentiate into various cell phenotypes.
The mechanisms underlying these differences remain poorly understood. We analyzed Ca2+ signals and membrane properties in rat adipose-derived stromal cells (ADSCs) and bone marrow stromal cells (BMSCs) in basal conditions, and then following a switch into medium that contains factors known to modify their character.
Modified ADSCs (mADSCs) expressed L-type Ca2+ channels whereas both L- and P/Q- channels were operational in mBMSCs. Both mADSCs and mBMSCs possessed functional endoplasmic reticulum Ca2+ stores, expressed ryanodine receptor-1 and -3, and exhibited spontaneous [Ca2+](i) oscillations.
The mBMSCs expressed P2X(7) purinoceptors; the mADSCs expressed both P2X (but not P2X(7)) and P2Y (but not P2Y(1)) receptors. Both types of stromal cells exhibited [Ca2+](i) responses to vasopressin (AVP) and expressed V-1 type receptors.
Functional oxytocin (OT) receptors were, in contrast, expressed only in modified ADSCs and BMSCs. AVP and OT-induced [Ca2+](i) responses were dose-dependent and were blocked by their respective specific receptor antagonists.
Electrophysiological data revealed that passive ion currents dominated the membrane conductance in ADSCs and BMSCs. Medium modification led to a significant shift in the reversal potential of passive currents from -40 to -50mV in cells in basal to -80mV in modified cells.
Hence membrane conductance was mediated by non-selective channels in cells in basal conditions, whereas in modified medium conditions, it was associated with K+-selective channels